Protein basics: what it actually does

Protein is one of three macronutrients, alongside carbohydrates and fat. It is made of amino acids, which your body uses to build and maintain tissues including muscle, skin and hair.

Most people can meet their needs through food. Protein powders and bars are simply a convenient way to add protein when a full meal isn't practical.

General guidance for adults is often around 0.8g per kilogram of body weight per day, with active people sometimes aiming higher. Needs vary, so speak to a registered dietitian for personal advice.